[Bug 196575] Need methods to write to disk from powerpc loader

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196575

            Bug ID: 196575
           Summary: Need methods to write to disk from powerpc loader
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: ppc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jhibbits at FreeBSD.org

The PowerPC loader doesn't currently support writing to disk from the loader. 
This causes 'nextboot -k' to always boot the next kernel, unless explicitly
unloaded, whereas on i386 once the test kernel is loaded, the behavior is
reverted back to the default kernel, in case of failure.

On powerpc (32-bit) the kernel can be unloaded, which reduces the impact of
this issue, but on powerpc64, unloading the kernel doesn't completely work, so
loading a new kernel does not work, and panics or load failures ensue.  Of
course, this itself should be fixed, to allow unloading, but that's another
problem entirely.

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